American fern journal - American Fern Society. (American Fern Society, 1925)

American fern journal - American Fern Society. (American Fern Society, 1928)

American fern journal - American Fern Society. (American Fern Society, 1931)

American fern journal - American Fern Society. (American Fern Society, 1932)

American fern journal - American Fern Society. (American Fern Society, 1933)

American fern journal - American Fern Society. (American Fern Society, 1934)

American fern journal - American Fern Society. (American Fern Society, 1935)

American fern journal - American Fern Society. (American Fern Society, 1936)

American fern journal - American Fern Society. (American Fern Society, 1937)

American fern journal - American Fern Society. (American Fern Society, 1938)